US4838364A - Electrically powered screw tightening tool - Google Patents

Electrically powered screw tightening tool Download PDF

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Publication number
US4838364A
US4838364A US07/123,796 US12379687A US4838364A US 4838364 A US4838364 A US 4838364A US 12379687 A US12379687 A US 12379687A US 4838364 A US4838364 A US 4838364A
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US
United States
Prior art keywords
release rod
condition
manoeuver
motor
tool
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US07/123,796
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English (en)
Inventor
Gunnar C. Hansson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ELECTRICALLY POWERED SCREW TIGHTENING TOOL ATLAS COPCO NACKA SWEDEN A CORP OF SWEDEN AB
Original Assignee
ELECTRICALLY POWERED SCREW TIGHTENING TOOL ATLAS COPCO NACKA SWEDEN A CORP OF SWEDEN AB
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Publication date
Application filed by ELECTRICALLY POWERED SCREW TIGHTENING TOOL ATLAS COPCO NACKA SWEDEN A CORP OF SWEDEN AB filed Critical ELECTRICALLY POWERED SCREW TIGHTENING TOOL ATLAS COPCO NACKA SWEDEN A CORP OF SWEDEN AB
Assigned to ELECTRICALLY POWERED SCREW TIGHTENING TOOL, ATLAS COPCO AKTIEBOLAG, NACKA, SWEDEN A CORP. OF SWEDEN reassignment ELECTRICALLY POWERED SCREW TIGHTENING TOOL, ATLAS COPCO AKTIEBOLAG, NACKA, SWEDEN A CORP. OF SWEDEN ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: HANSSON, GUNNAR C.
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Publication of US4838364A publication Critical patent/US4838364A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B25B23/147—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for electrically operated wrenches or screwdrivers

Definitions

  • This invention relates to an electrically powered screw tightening tool.
  • the invention concerns a tool of the above type comprising a housing, an electric rotation motor, torque transmitting means connecting said motor to an output shaft and including a torque responsive clutch and a trip means associated with said clutch, an axially displaceable release rod supported by said trip means and extending axially through said motor, a switch located in said housing and shiftable between an ON-condition and an OFF-condition for controlling the power supply to said motor, and a manoeuver means supported in said housing and movable in a direction substantially transverse to the rotation axis of said motor between a rest position and an active position.
  • the main object of the invention is to provide a simple mechanism by which the power supply switch of the tool is operable both by the clutch controlled release rod and by the operator controlled manoeuver means.
  • a tool of the above described type having a mechanism according to the invention is characterized by an activating means which on one hand is connected to and conjointly movable with said release rod and which on the other hand is coupled to said manoeuver means for displacement together therewith in said substantially transverse direction, said activating means being arranged to engage said switch and to cause shifting of the latter from said OFF-condition to said ON-condition when displaced together with said manoeuver means as a the latter is moved from said rest position to said active position and to cause shifting of said switch from said ON-condition to said OFF-condition when displaced axially together with said release rod as the latter is released by said trip means.
  • FIGS. 1a and 1b show together, partly in section, a side view of a screw tightening tool according to the invention.
  • the tool illustrated on the drawing is an electrically powered angle nut runner comprising a housing 10 in which is supported an electric rotation motor 11, torque transmitting means 12 coupling the motor 11 to an output shaft 13, and a power supply means in the form of a switch 14.
  • the torque transmitting means 12 includes a drive shaft 15 and a torque responsive clutch 16 which comprises a spring biassed, axially movable sleeve 17, a number of conical rollers 18 and a transversely displaceable trip element 19.
  • the latter has an oblique end surface 20 and is spring biassed into contact with an oblique surface 21 on the sleeve 17.
  • the trip element 19 is formed with an axially directed aperture 22.
  • a release rod 23 extends axially through the motor 11 and the drive shaft 15 and is endwise supported by the trip element 19.
  • a driven shaft 24 is provided with a cam portion 25 which forms part of the clutch 16 and which cooperates with the rollers 18 to transmit torque to the shaft 24.
  • the torque transmitting means 12 is of a previously known design commonly used in pneumatically powered screw driving tools.
  • the switch 14 by which the motor 11 is supplied with electric power is shiftable in an axial direction between an ON-condition and an OFF-condition. Shifting of the switch 14 from OFF-condition to ON-condition is accomplished manually by the operator via an external lever 27, whereas shifting of the switch 14 from ON-condition to OFF-condition takes place automatically by the action of the torque responsive clutch 16, the trip element 19 and the release rod 23.
  • the mechanism by which the switch 14 is shifted comprises an activating rod 28 which is coupled with its one end to the release rod 23 via a universal joint 30.
  • the latter comprises a flat head 31 rigidly mounted on the release rod 23, a steel ball 32 pressed against the head 31 by a hollow piston 33, and a spring 34 biassing the piston 33 axially toward the release rod 23.
  • the activating rod 28 is endwise supported on the steel ball 32 and extends through a transverse opening 36 in a manoeuver plunge 37 which is arranged to be activated by the lever 27.
  • the manoeuver plunge 37 is movably guided in the housing 10 for displacement in a direction transverse to the rotation axis of the motor 11 and the release rod 23.
  • the rear end 38 of the activating rod 28 is arranged to form a cam means together with a slanted lever 39 on the switch 14.
  • the lever 39 is spring biassed toward the OFF-condition of the switch 14.
  • a reset lever 41 has the shape of an L and is pivotally supported on a transverse pin 40 in the housing 10 by the end of one of its legs 42. This leg 42 comprises an aperture 43 through which the release rod 23 extends. The other leg 44 of the reset lever 41 is arranged to engage the inner end of the manoeuver plunge 37.
  • a compression spring 45 acts between a transverse wall 46 in the housing 10 and the leg 42 of the reset lever 41.
  • the cam portion 25 of the driven shaft 24 starts to urge the rollers 18 outwardly such that the conical ends of the latters displaces the sleeve 17 upwards. Due to cooperation between the oblique end surface 20 of the trip element 19 and the oblique surface 21 of the sleeve 17 the trip element 19 is displaced to the right against its spring bias. The aperture 22 in the trip element 19 is brought into alignment with the release rod 23 whereby the latter falls down through the aperture 22. An axial movement of the release rod 23 is obtained as a result of a certain torque level is reached in the screw joint being tightened.
  • the switch activating means has to be restored. This is accomplished simply by letting out the manoeuver lever 27, enabling the reset lever 41 by action of spring 45 to pull the release rod 23 back rearwards against the action of spring 34 such that the forward end of the release rod 23 is raised above the trip element aperture 22.
  • the trip element 19 is thereby free to resume its left hand position in which the aperture 22 is out of alignment with the release rod 23.
  • the other leg 44 of the reset lever 41 urges the manoeuver plunge 37 to the left, thereby bringing the activating rod 28 with it such that the rear end 38 of the latter is displaced out of engagement with the slanted lever 39 of the switch 14. A full operating cycle is now completed.
  • the device according to the invention is advantageous in that it provides a simple mechanism for semiautomatic control of the power supply via a single switch.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
US07/123,796 1986-11-27 1987-11-23 Electrically powered screw tightening tool Expired - Lifetime US4838364A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8605086 1986-11-27
SE8605086A SE461510B (sv) 1986-11-27 1986-11-27 Aktiveringsarrangemang vid elektrisk skruvdragare

Publications (1)

Publication Number Publication Date
US4838364A true US4838364A (en) 1989-06-13

Family

ID=20366426

Family Applications (1)

Application Number Title Priority Date Filing Date
US07/123,796 Expired - Lifetime US4838364A (en) 1986-11-27 1987-11-23 Electrically powered screw tightening tool

Country Status (6)

Country Link
US (1) US4838364A (ja)
JP (1) JPS63221979A (ja)
DE (1) DE3740076C2 (ja)
FR (1) FR2607420B1 (ja)
GB (1) GB2198067B (ja)
SE (1) SE461510B (ja)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5156221A (en) * 1990-06-22 1992-10-20 Ceka Elektrowerkzeuge Ag & Co. Kg Method of and arrangement for controlling the operation of a hand-held electrical device
US6244358B1 (en) * 2000-01-13 2001-06-12 Snap-On Technologies, Inc. Trigger and clutch arrangement for power tools
EP1112819A2 (en) 1999-12-28 2001-07-04 Atlas Copco Tools Ab Power nut runner with torque responsive power shut-off capacity
US20110127059A1 (en) * 2008-08-06 2011-06-02 Kurt Limberg Precision torque tool
US9289886B2 (en) 2010-11-04 2016-03-22 Milwaukee Electric Tool Corporation Impact tool with adjustable clutch

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2618428B2 (ja) * 1988-03-30 1997-06-11 株式会社 マキタ 電動工具の回転制御装置
US4934494A (en) * 1988-03-30 1990-06-19 Makita Electric Works, Ltd. Combined locking mechanism and switch especially for power tools
SE8902101L (sv) * 1989-06-12 1990-12-13 Atlas Copco Tools Ab Mutterdragare foer aatdragning av skruvfoerband
US5738177A (en) * 1995-07-28 1998-04-14 Black & Decker Inc. Production assembly tool

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3419087A (en) * 1967-03-30 1968-12-31 Chicago Pneumatic Tool Co Torque controlled electric nut-runner with solenoid brake
US3970151A (en) * 1975-07-03 1976-07-20 Gardner-Denver Company Torque responsive motor shutoff for power tool
EP0063460A2 (en) * 1981-04-13 1982-10-27 Desoutter, Limited Motor driven power tool

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1987095U (de) * 1968-06-06 Chicago Pneumatic Tool Company, New York, N. Y. (V. St. A.) Drehmomentgeregelter Drehschrauber
US2052152A (en) * 1932-05-19 1936-08-25 Arthur B Webb Torque transmission mechanism
DE1163259B (de) * 1951-01-26 1964-02-13 Chicago Pneumatic Tool Co Motorisch angetriebener Drehschlagschrauber
DE1159867B (de) * 1959-06-20 1963-12-19 Fein C & E Schlagschrauber mit drehmomentabhaengiger Abschaltung des insbesondere elektromotorischen Antriebs
DE1503022A1 (de) * 1962-03-03 1969-10-30 Reed Roller Bit Co Durch ein Druckmedium betaetigtes Werkzeug
US3195704A (en) * 1962-08-02 1965-07-20 Rockwell Mfg Co Torque responsive control for motor driven tool
US3334487A (en) * 1965-09-07 1967-08-08 Ingersoll Rand Co Impulse tool with improved cut-off device
JPS52151998A (en) * 1976-06-14 1977-12-16 Olympic Fishing Tackles Co Torque controlling device of motor tool
US4265320A (en) * 1977-05-16 1981-05-05 Matsushita Electric Industrial Co., Ltd. Electrically powered torque-controlled tool
US4223745A (en) * 1978-09-15 1980-09-23 Cooper Industries, Inc. Torque responsive motor shutoff mechanism for fluid operated tool

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3419087A (en) * 1967-03-30 1968-12-31 Chicago Pneumatic Tool Co Torque controlled electric nut-runner with solenoid brake
US3970151A (en) * 1975-07-03 1976-07-20 Gardner-Denver Company Torque responsive motor shutoff for power tool
EP0063460A2 (en) * 1981-04-13 1982-10-27 Desoutter, Limited Motor driven power tool

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5156221A (en) * 1990-06-22 1992-10-20 Ceka Elektrowerkzeuge Ag & Co. Kg Method of and arrangement for controlling the operation of a hand-held electrical device
EP1112819A2 (en) 1999-12-28 2001-07-04 Atlas Copco Tools Ab Power nut runner with torque responsive power shut-off capacity
US6662882B2 (en) * 1999-12-28 2003-12-16 Atlas Copco Tools Ab Power nut runner with torque responsive power shut-off capacity
US6244358B1 (en) * 2000-01-13 2001-06-12 Snap-On Technologies, Inc. Trigger and clutch arrangement for power tools
US20110127059A1 (en) * 2008-08-06 2011-06-02 Kurt Limberg Precision torque tool
US8851201B2 (en) 2008-08-06 2014-10-07 Milwaukee Electric Tool Corporation Precision torque tool
US9289886B2 (en) 2010-11-04 2016-03-22 Milwaukee Electric Tool Corporation Impact tool with adjustable clutch

Also Published As

Publication number Publication date
SE461510B (sv) 1990-02-26
SE8605086D0 (sv) 1986-11-27
FR2607420A1 (fr) 1988-06-03
SE8605086L (sv) 1988-05-28
DE3740076A1 (de) 1988-06-01
GB2198067B (en) 1990-08-22
JPS63221979A (ja) 1988-09-14
GB8727802D0 (en) 1987-12-31
DE3740076C2 (de) 1997-01-16
GB2198067A (en) 1988-06-08
FR2607420B1 (fr) 1991-05-03

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Owner name: ELECTRICALLY POWERED SCREW TIGHTENING TOOL, ATLAS

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